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Ummmm .... why is one even needed? As a Shearwater owner for years (Petrel and Perdix), I don't see the need for something like this. It solves a non-existent "problem".
Regardless, I've not seen these for sale in the US. Perhaps that is because they aren't actually needed. Seems like another useless scuba gadget to me.
Maybe simply scuba would do a bulk order to the US and you could sell them here on the board. I'm sure you could find a couple dozen interested folks.